Capillary surfers: Wave-driven particles at a vibrating fluid interface
Résumé
A small solid particle resting atop a vibrating fluid interface generates field of outwardly propagating capillary waves due to its relative vertical motion. In this paper, we show that if the particle's symmetry is broken, resultant unbalanced wave stresses enable steady self-propulsion along interface. Such ``capillary surfers'' interact with each other hydrodynamically at long range via their mutual wavefield and form number dynamic bound states. This new active system bridges gap between dissipation- inertia-dominated regimes promises novel collective behaviors.
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